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Re^3: Time::Piece reversibility

by cguevara (Vicar)
on Jun 18, 2017 at 20:19 UTC ( #1193064=note: print w/replies, xml ) Need Help??


in reply to Re^2: Time::Piece reversibility
in thread Time::Piece reversibility

#!/usr/bin/env perl use strict; use warnings; use Test::More ('no_plan'); use Time::Piece; $ENV{'TZ'} = 'America/Los_Angeles'; my $datestr = '2017-06-19 10:07:42'; my $t = localtime->strptime($datestr, '%Y-%m-%d %H:%M:%S'); is($Time::Piece::VERSION, 1.31); is($t->epoch, 1497892062); is($t->tzoffset, -25200); is($t->strftime, 'Mon, 19 Jun 2017 10:07:42 PDT'); is($t->strftime('%Y-%m-%d %H:%M:%S'), $datestr);

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Re^4: Time::Piece reversibility
by mla12 (Acolyte) on Jun 18, 2017 at 20:52 UTC

    Thanks again. So localtime()->strptime does behave differently.

    So localtime()->strptime's handling of time zones is the underlying issue. Certainly these two should be equivalent, no?

    #!/usr/bin/env perl use strict; use warnings; use Test::More ('no_plan'); use Time::Piece; $ENV{'TZ'} = 'America/Los_Angeles'; my @tests = ( ['2017-06-19 10:07:42', '%Y-%m-%d %H:%M:%S'], ['2017-06-19 10:07:42-0700', '%Y-%m-%d %H:%M:%S%z'], ); is($Time::Piece::VERSION, 1.31); foreach my $test (@tests) { my ($datestr, $fmt) = @$test; my $t = localtime->strptime($datestr, $fmt); is($t->epoch, 1497892062); is($t->tzoffset, -25200); is($t->strftime, 'Mon, 19 Jun 2017 10:07:42 PDT'); is($t->strftime('%Y-%m-%d %H:%M:%S'), $datestr); }

    Result

    ok 1 ok 2 ok 3 ok 4 ok 5 not ok 6 # Failed test at ./try7 line 22. # got: '1497917262' # expected: '1497892062' ok 7 not ok 8 # Failed test at ./try7 line 24. # got: 'Mon, 19 Jun 2017 17:07:42 PDT' # expected: 'Mon, 19 Jun 2017 10:07:42 PDT' not ok 9 # Failed test at ./try7 line 25. # got: '2017-06-19 17:07:42' # expected: '2017-06-19 10:07:42-0700' 1..9 # Looks like you failed 3 tests of 9.

      I've only used localtime->strptime() to get a localtime instance from a time without a time zone.

      To get a localtime instance directly from a time with a time zone, I just combine localtime and Time::Piece->strptime()->epoch.

      #!/usr/bin/env perl use strict; use warnings; use Test::More ('no_plan'); use Time::Piece; $ENV{'TZ'} = 'America/Los_Angeles'; my $datestr = '2017-06-19 10:07:42-0700'; my $t = localtime(Time::Piece->strptime($datestr, '%Y-%m-%d %H:%M:%S%z +')->epoch); is($Time::Piece::VERSION, 1.31); is($t->epoch, 1497892062); is($t->tzoffset, -25200); is($t->strftime, 'Mon, 19 Jun 2017 10:07:42 PDT'); is($t->strftime('%Y-%m-%d %H:%M:%S%z'), $datestr);

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